//
//  QRReaderViewController.m
//  danpin
//
//  Created by chuangjia on 9/11/2015.
//  Copyright © 2015 chuangjia. All rights reserved.
//

#import "QRReaderViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface QRReaderViewController () <AVCaptureMetadataOutputObjectsDelegate>
{
    int num;
    BOOL upOrdown;
    NSTimer * timer;
}
@property (strong,nonatomic)AVCaptureDevice * device;
@property (strong,nonatomic)AVCaptureDeviceInput * input;
@property (strong,nonatomic)AVCaptureMetadataOutput * output;
@property (strong,nonatomic)AVCaptureSession * session;
@property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview;
@property (nonatomic, strong) UIImageView * line;
@end

@implementation QRReaderViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.view.backgroundColor= [UIColor colorWithWhite:0 alpha:0.8];
    [self initUI];
}
-(void)initUI
{
    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
    backButton.frame = CGRectMake(10, 20, 40, 40);
    backButton.tag =0;
    [backButton setImage:[UIImage imageNamed:@"title_back"] forState:UIControlStateNormal];
    [backButton addTarget:self action:@selector(clickNavEvent) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:backButton];
    

    UILabel * labIntroudction= [[UILabel alloc] initWithFrame:CGRectMake((self.view.frame.size.width-290)/2, 420, 290, 50)];
    labIntroudction.backgroundColor = [UIColor clearColor];
    labIntroudction.numberOfLines=2;
    labIntroudction.textColor=[UIColor whiteColor];
    labIntroudction.text=@"将二维码图像置于矩形方框内，离手机摄像头10CM左右，系统会自动识别。";
    [self.view addSubview:labIntroudction];
    
    UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake((self.view.frame.size.width-300)/2, 100, 300, 300)];
    imageView.image = [UIImage imageNamed:@"pick_bg"];
    [self.view addSubview:imageView];
    
    upOrdown = NO;
    num =0;
    _line = [[UIImageView alloc] initWithFrame:CGRectMake((self.view.frame.size.width-220)/2, 110, 220, 2)];
    _line.image = [UIImage imageNamed:@"line"];
    [self.view addSubview:_line];
    
    timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation1) userInfo:nil repeats:YES];
}
-(void)animation1
{
    if (upOrdown == NO) {
        num ++;
        _line.frame = CGRectMake((self.view.frame.size.width-220)/2, 110+2*num, 220, 2);
        if (2*num == 280) {
            upOrdown = YES;
        }
    }
    else {
        num --;
        _line.frame = CGRectMake((self.view.frame.size.width-220)/2, 110+2*num, 220, 2);
        if (num == 0) {
            upOrdown = NO;
        }
    }
    
}
-(void)clickNavEvent
{
    [_session stopRunning];
    [timer invalidate];
    if ([_delegate respondsToSelector:@selector(cancelQRReader)]) {
        [_delegate cancelQRReader];
    }
  
}
-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self setupCamera];
}
- (void)setupCamera
{
    self.view.layer.backgroundColor =[UIColor colorWithWhite:0 alpha:0.8].CGColor;
    // Device
    _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    // Input
    _input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
    
    // Output
    _output = [[AVCaptureMetadataOutput alloc]init];
    [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    
    // Session
    _session = [[AVCaptureSession alloc]init];
    [_session setSessionPreset:AVCaptureSessionPresetHigh];
    if ([_session canAddInput:self.input])
    {
        [_session addInput:self.input];
    }
    
    if ([_session canAddOutput:self.output])
    {
        [_session addOutput:self.output];
    }
    // 条码类型 AVMetadataObjectTypeQRCode
    _output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];
    
    // Preview
    _preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session];
    _preview.videoGravity = AVLayerVideoGravityResizeAspect;
    _preview.frame =self.view.frame;//CGRectMake((self.view.frame.size.width - 280)/2,110,280,280);
    [self.view.layer insertSublayer:self.preview atIndex:0];
    // Start
    [_session startRunning];
}
#pragma mark AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    
    NSString *stringValue;
    
    if ([metadataObjects count] >0)
    {
        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
        stringValue = metadataObject.stringValue;
    }
    
    [_session stopRunning];
    [timer invalidate];
    if ([_delegate respondsToSelector:@selector(qRReaderOK:)]) {
        [_delegate qRReaderOK:stringValue];
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
    [_session stopRunning];
    [timer invalidate];
}
-(void)dealloc
{
    [_session stopRunning];
    [timer invalidate];
}
@end
